3 x - 15*x + 4
x^3 - 15*x + 4 при x = 1/3
x^3 - 15*x + 4
(1/3)^3 - 15*(1/3) + 4
(1/3)^3 - 15/3 + 4
-26/27
4.0 + x^3 - 15.0*x
/ 2\ 4 + x*\-15 + x /
/ 2 \ (4 + x)*\1 + x - 4*x/